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(a) What do you understand by the power of a lens? Name one factor on which the power of a lens depends. (b) What is the unit of power of a lens? Define the unit of power of a lens. (c) A combination of lenses for a camera contains two converging lenses of focal lengths 20 cm and 40 cm and a diverging lens of focal length 50 cm. Find the power and focal length of the combination. |
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Answer» (a) What do you understand by the power of a lens? Name one factor on which the power of a lens depends. (b) What is the unit of power of a lens? Define the unit of power of a lens. (c) A combination of lenses for a camera contains two converging lenses of focal lengths 20 cm and 40 cm and a diverging lens of focal length 50 cm. Find the power and focal length of the combination. |
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